Engineer&#39;s valve.



H. W. CHENEY.

ENGINEERS VALVE.

APPLICATION FILED OUT. 20, 1911.

1 030 229 Patented June 18, 1912.

WITNEEEEE- INVENTOR- 6m/ WM E ATTUF NEY- inviT STATES PATENT FFIGE.

HERBERT W. CHENEY, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHALMERS COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

ENGINEERS VALVE.

Specification of Letters Patent.

Application filed. October 20, 1911.

Patented June 18, 1912.

Serial No. 655,691.

To all whom it may concern:

Be it known that I, HERBERT WV. CHENEY, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Engineers Valves, of which the following is a specification.

This invention relates to improvements in the construction of engineers valves for use in controlling air brake systems of railway cars.

The object of the invention is to provide an engineers valve in which the valve and valve stem are automatically returned to lap or mid-position, so that if the operating handle is removed from the stem while the valve is in any other position than lap position, that is, in brake set or brake release position, the valve will be automati: cally returned to lap position.

A clear conception of one embodiment of the invention can be had by referring to the accompanying drawing forming a part of this specification, in which like reference characters designate the same or similar parts in the different views.

Figure 1 is a central vertical section through a rotary engineers valve having a means for returning the valve to lap or hold position, applied thereto. Fig. 2 is a section through the valve and valve stem, the section being taken on the line IIII of Fig. 1, looking downward.

The engineers valve consists essentially of a valve casing or cap 2, a valve stem 3, valve body 12, valve seat 13, and valve seat support or base 14;. The operating handle 1 coacts with the upper end of the valve stem 3, thereby permitting rotation of the stem and through it the valve 12. The handle 1 may be removed from the stem 3 with the valve 12 in any position. An oil pan 4 is formed in one with the stem 3 within the cap 2. A transverse key 11 is formed in one with the lower portion of the stem 3 and is adapted to coact in a slot formed in the upper portion of the valve 12. The valve 12 is adapted to control a series of ports 15, 16, passing through the valve seat 18 and valve seat support or base 14.

The helical spring 5 is coiled around the portion 9 of the stem 3 between the oil pan 4 and the key 11. The spring 5 has outwardly projecting ends 8,,18, which coact against opposite sides of the lug7 and central stop or rib 6. The lug 7 is formed in one with the key 11 and can be removed from the stem 3 with the removal of the key 11 by withdrawing the screw 10. The rib 6 projects radially inward from the cap 2, being formed in one with the cap 2.

During the operation of the valve, the stem 3 is given an oscillatory movement to either side of the central or lap position, in which position the valve is disclosed in the drawing, thereby rotating the valve 12 by means of the key 11 to form a connection between various ports to either release or set the brakes, as desired. Suppose the valve 12 to be rotated through the medium of the stem and handle 1 in an anti-clockwise di rection. The end 8 of the spring 5 will then retain its coaction with the rib 6, while its contact with the lug 7 will be broken. The end 18 of the spring 5 will break its contact with the rib 6 and will maintain its coaction with the lug 7. The rotation of the stem will cause the spring 5 to be wound more tightly around the portion 9 of the stem, thereby compressing the spring 5. Upon releasing the turning pressure applied to the handle 1, the spring 5 will immediately return the stem 3 and hence the valve 12 to the position shown in Fig. 2.

By turning the valve 12 in a clockwise direction, the end 18 of the spring 5 will retain its coaction with the rib 6 only, while the end 8 will retain its coaction with the lug 7 only. Upon releasing the turning pressure, the stem 8 will again be returned to lap position.

It will be seen from this construction, that if the handle 1 is removed from the valve and the stem should by any means be turned to any position other than lap, a release of ing said valve, a single stop on said casing,

and a spring having ends directly engaging opposite sides of said stop and adapted to return said valve to normal from any other position.

3. In an engineers valve, a casing, a valve 7 Within said casing, a stem for operating said valve, means for operating said stem, and a spring for automatically returning said valve and stem to normal from any other position, said spring surrounding said stem and having end portions directly engaging a portion of the inner Wall of said casing.

4. In an engineers valve, a casing, a valve Within said casing, means for operating said valve, a stop on said casing, and a helical spring having end portions directly engaging said stop, the engagement between said spring ends and stop being such that movement of said valve away from normal position will cause said spring to coil up.

In testimony whereof, I hereto affix my signature in HERBERT W. CHENEY. W itnesses CHAS. L. BYRON, WV. H. LIEBER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

the presence of two Witnesses. 

